Proxy War: A proxy war is a conflict where two opposing powers use third parties as substitutes for direct confrontation. The Korean War can be seen as a proxy war between communist forces (supported by China and the Soviet Union) against capitalist forces (supported by the United States).
Ideological Differences: Ideological differences refer to disagreements based on opposing political or economic beliefs. In this context, it relates to the ideological divide between communist China and capitalist South Korea, which contributed to tensions leading up to the Korean War.
Military Intervention: Military intervention refers to outside interference by armed forces in another country's affairs. Communist China's military intervention on behalf of North Korea triggered hostilities in Korea during the Korean War.